Sexual maturity of the deep-sea royal crab Chaceon ramosae Manning, Tavares & Albuquerque, 1989 (Brachyura: Geryonidae) in southern Brazil

The royal crab Chaceon ramosae is one of the three species of deep-sea crabs currently exploited in Brazil. The royal crab fishery started in 2001 with foreign vessels that were extensively monitored by observers and tracked by satellite. A management plan implemented in 2005 was based only on bioma...

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Autores principales: Pezzuto,Paulo Ricardo, Sant'Ana,Rodrigo
Lenguaje:English
Publicado: Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2009
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Acceso en línea:http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2009000300003
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spelling oai:scielo:S0718-560X20090003000032010-03-17Sexual maturity of the deep-sea royal crab Chaceon ramosae Manning, Tavares & Albuquerque, 1989 (Brachyura: Geryonidae) in southern BrazilPezzuto,Paulo RicardoSant'Ana,Rodrigo deep-water resources reproduction trap fisheries relative growth sexual maturity Geryonidae Chaceon ramosae continental slope Brazil The royal crab Chaceon ramosae is one of the three species of deep-sea crabs currently exploited in Brazil. The royal crab fishery started in 2001 with foreign vessels that were extensively monitored by observers and tracked by satellite. A management plan implemented in 2005 was based only on biomass dynamics, as biological knowledge of the resource was limited at that date. Samples taken aboard were used to determine size at first sexual maturity for males and females by studying the use of allometric growth of chelae and abdomen in relation to carapace width (CW), the proportion of females with opened vulvae and eggs in the pleopods, and males showing copula marks on the first ambulatory legs. Morphometric maturity was attained, on average, at 12.1 cm (males) and 10.7 cm (females). The CW50% was estimated to be 10.9 cm and 12.2 cm for females, respectively considering the vulva condition and eggs in the pleopods, and 13.6 cm for males. By size class, the maximum estimated proportions of ovigerous females by size class was 0.4 and of males with copula marks was 0.6, suggesting a bi-annual reproductive cycle for individuals of the species. The size composition analysis showed that irnmature individuals may comprise up to 70% of the catches. These results indicate the need to consider enhanced trap selectivity and lower mortality of ovigerous females as new and immediate goals to improve resource management.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.37 n.3 20092009-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2009000300003en
institution Scielo Chile
collection Scielo Chile
language English
topic deep-water resources
reproduction
trap fisheries
relative growth
sexual maturity
Geryonidae
Chaceon ramosae
continental slope
Brazil
spellingShingle deep-water resources
reproduction
trap fisheries
relative growth
sexual maturity
Geryonidae
Chaceon ramosae
continental slope
Brazil
Pezzuto,Paulo Ricardo
Sant'Ana,Rodrigo
Sexual maturity of the deep-sea royal crab Chaceon ramosae Manning, Tavares & Albuquerque, 1989 (Brachyura: Geryonidae) in southern Brazil
description The royal crab Chaceon ramosae is one of the three species of deep-sea crabs currently exploited in Brazil. The royal crab fishery started in 2001 with foreign vessels that were extensively monitored by observers and tracked by satellite. A management plan implemented in 2005 was based only on biomass dynamics, as biological knowledge of the resource was limited at that date. Samples taken aboard were used to determine size at first sexual maturity for males and females by studying the use of allometric growth of chelae and abdomen in relation to carapace width (CW), the proportion of females with opened vulvae and eggs in the pleopods, and males showing copula marks on the first ambulatory legs. Morphometric maturity was attained, on average, at 12.1 cm (males) and 10.7 cm (females). The CW50% was estimated to be 10.9 cm and 12.2 cm for females, respectively considering the vulva condition and eggs in the pleopods, and 13.6 cm for males. By size class, the maximum estimated proportions of ovigerous females by size class was 0.4 and of males with copula marks was 0.6, suggesting a bi-annual reproductive cycle for individuals of the species. The size composition analysis showed that irnmature individuals may comprise up to 70% of the catches. These results indicate the need to consider enhanced trap selectivity and lower mortality of ovigerous females as new and immediate goals to improve resource management.
author Pezzuto,Paulo Ricardo
Sant'Ana,Rodrigo
author_facet Pezzuto,Paulo Ricardo
Sant'Ana,Rodrigo
author_sort Pezzuto,Paulo Ricardo
title Sexual maturity of the deep-sea royal crab Chaceon ramosae Manning, Tavares & Albuquerque, 1989 (Brachyura: Geryonidae) in southern Brazil
title_short Sexual maturity of the deep-sea royal crab Chaceon ramosae Manning, Tavares & Albuquerque, 1989 (Brachyura: Geryonidae) in southern Brazil
title_full Sexual maturity of the deep-sea royal crab Chaceon ramosae Manning, Tavares & Albuquerque, 1989 (Brachyura: Geryonidae) in southern Brazil
title_fullStr Sexual maturity of the deep-sea royal crab Chaceon ramosae Manning, Tavares & Albuquerque, 1989 (Brachyura: Geryonidae) in southern Brazil
title_full_unstemmed Sexual maturity of the deep-sea royal crab Chaceon ramosae Manning, Tavares & Albuquerque, 1989 (Brachyura: Geryonidae) in southern Brazil
title_sort sexual maturity of the deep-sea royal crab chaceon ramosae manning, tavares & albuquerque, 1989 (brachyura: geryonidae) in southern brazil
publisher Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate 2009
url http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2009000300003
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